[Survey of an outbreak of mycoplasmal pneumonia firstly discovered in Zhejiang Province].

An exceptional outbreak of mycoplasmal pneumonia in a factory of prisoners, Juzhou city, Zhejiang province, during November to December, 1985 was reported. In the course of the epidemic 102 cases were infected, with an attack rate of 3.3 per cent, but the attack rate in the outbreak point was 29.1 per cent. All cases were not dead. This outbreak was diagnosed as mycoplasmal pneumonia by clinical observation, X ray examination serological test and epidemiological survey. The sources of infection were 3 sporadic patients. The epidemic was quickly controlled by using comprehensive preventive measures.